ИСТИНА

Kamptozoa, or Entoprocta, is a type of invertebrate animals which remains poor фчstudied in the Seas of Russia. Only about 20 species were described from the Russian Arctic Seas, mainly from the basin of the White Sea. A diversity of entoprocts in the Kara Sea still remains unstudied. In this research were studied entoprocts lived as epibionts of polychaetes and sipunculid worms. Material was collected during 128 Expedition aboard RV "Professor Shtokman" in August - September, 2014 and 63 Expedition aboard RV “Akademik Mstislav Keldysh” in September - October, 2015 to the Kara Sea. Solitary entoprocts from the Loxosomatidae family have been found on elytrons and chaetae of the notopodia of Eunoe sp. and Bylgides sp. (Polynoidae); on the gills, the parapodia and in the groove between the notopodia and the neuropodia of Aglaophamus malmgreni (Nephtidae), and on the body of Phascolion strombi (Sipunculida). Five species from two genera were found: Emschermannia ramificata Borisanova, 2016; Loxosomella antis Krylova, 1985; Loxosomella brumpti (Nilus, 1909), Loxosomella harmeri (Schultz, 1895); and one new species, Loxosomella sp.n. Emschermannia ramificata was found in the groove between the notopodia and the neuropodia of Aglaophamus malmgreni. This species has been described only from the Kara Sea for now. All studied representatives were attached to a substratum by several long psedvostolons. Only two individuals with buds were noted, but many representatives were found with developing larvae in calyxes. Loxosomella antis was found on the chaeta of the notopodia of polynoids Eunoe sp. and Bylgides sp. This species was previously described from the White Sea on the chaeta the notopodia of Antinoella sp. (Polynoidae). L. antis is very usual epibiont of studied polynoids and the representatives of this species were found great numbers. The distinctive feature of L. antis is a presence of special epithelial pockets on each side of calyx. Buds develop in these pockets. Individuals with buds have not embryos in calyxes, while up to 16 embryos were found in calyxes of not budding individuals. Loxosomella harmeri was found on the elytrons of Polynoidae (on the edge of elytrons and also on the internal and theouter surfaces). L. harmeri was earlier described from the White Sea and the North Sea. The individuals from the Kara Sea differ by a little longer stalk. Buds emerge from lateral areas, up to three buds on one side. Embryos were not observed. Several individuals of Loxosomella brumpti were found on the back end of the body of sipunculid worm Phascolion strombi. L. brumpti was earlier described from the Barents Sea. One individual was found with one young bud. Embryos were not observed. Loxosomella sp.nov. was found on the tips of dorsal cirri and sometimes on the tips of gills of Aglaophamus malmgreni. This is small species with total body length up to 200-300 µm. Stalk of the species is very short (20-40 µm) with expanded basis which covers a tip of a cirri or a gill. Calyx bears 8 tentacles. Buds form from the frontal area of calyx, up to 5 buds are developing simultaneously. Large buds with well-developed foot. Some individuals were found with one or two developing larvae on each side of calyx, some individuals with large oocytes in ovaries. This species is similar to Loxosomella brachystipes Franzén, 1973 found on the gills of Aglaophamus virginis in South Ocean. L. brachystipes also has very small stalk with attachment disc, but it differs by budding area, tentacle number and position on the gills.